Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details)

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Stockholders' Equity (Details) - USD ($)
3 Months Ended 12 Months Ended
Apr. 28, 2017
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
May 31, 2014
Class of Stock [Line Items]            
Authorized amount of common stock repurchase           $ 50,000,000
Number of shares repurchased (in shares)   0 0      
Common Stock            
Class of Stock [Line Items]            
Authorized amount of common stock repurchase $ 50,000,000          
Repurchase period (in years) 1 year     1 year 1 year